Abstract
Radish (Raphanus sativus L., cv. Saxa Treib) seedlings were continuously irradiated in a factorial design with UV-A, UV-B, and visible radiation. Plant growth, measured in terms of changes in fresh weight, was markedly reduced in all treatments where UV-B radiation was present, and especially when unfiltered radiation was employed, allowing small amounts of UV-C radiation to reach the plants. Simultaneously applied UV-A radiation did not improve growth: whereas the addition of white light to UV-A and UV-B radiation increased fresh weight. Anthocyanin and flavonoid production were affected in an opposite manner to fresh weight. UV-A radiation was not effective in inducing anthocyanin and flavonoid biosynthesis; whereas UV-B radiation produced increasing amounts of these pigments with increasing UV-B irradiance. The induction of flavonoid synthesis seemed to be more sensitive to UV-B radiation than that of anthocyanins. Soluble proteins were similarly affected.
Published Version
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